Custom chart catalog packaging

Can someone point me to some instructions for packaging a custom rancher chart catalog in CI?

I’ve looked through the github repos under rancher and they all seem to use spurious drone configurations with no details.

I know I need to package them up with some odd structure that helm doesn’t understand but rancher does but I can’t find anything to us as a reference to get my CI working for this.

I have my own helm chart repo working, but that doesn’t use app versions like rancher allows.